Communication protocols / Integration
REST
SOAP
WebRTC
JMS
STOMP
Kafka
XMPP
Computing clouds
AWS
Azure
DigitalOcean
GCP
OVHCloud
Linode
Vultr
Frontend
Vue.js
React.js
Nuxt.js
Next.js
Redux
HTML5
CSS3
Angular
Database
PostgreSQL
Oracle
MS SQL Server
MySQL
MariaDB
MongoDB
Redis
Memcached
Cassandra
Lucene
Elasticsearch
Neo4j
Blazegraph
Deploy
Docker
Kubernetes
Helm
Rancher
Terraform
OpenStack
OpenShift
Programming languages
Java
Groovy
JavaScript
TypeScript
Python
SQL
Bash
Kotlin
R
C#
Ecosystems
Java/JVM
Spring Boot
Node.js
.NET Core
Service integrations
Przelewy24
Mailgun
Prismic
Orlen
ZUS
ING / Payvision PSP
Ctoutvert (Channel Manager)
Sequisoft (Channel Manager)
McRent (Rental Company)
JustSend
JotForm
Mandrill
e-commerce
WordPress
Shopify
MediaWiki
Blockchain/DLT
Quantum Ledger DB
Ethereum
CORDA
CI/CD
Maven
Gradle
GitLab CI
Jenkins
Ansible
JUnit
Spock